Machine for cutting forms.



E. L PATTEN.

MACHINE FOR CUTTING FORMS.

"APPLICATION FILED JUNE 15. 1914.

ILAMAQQO Patented June 29,1915

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UNITE TATEs PATENT canton;

ERNEST L. PATTEN, 0F MALlOEN, MASSACHUSETTS, ASSIGNOB TO WELLMAN COMPANY,

OF MEDFORD, MASSACHUSETTS, A CORPORATION OF MAINE.

MACHINE non cur ains Foaivis.

n aagaee.

Specification of Letters Patent. Patented June 29 1915;

Application filed 'June15, 1914'. Sri'aI'No. 8 15144.

. T 0 all whom it may concern:

Be it knowi that I ERNEST L. PATTEN, ,of Maiden, in the county of lvliddlesex and- State of Massachusetts, have invented anew and useful Machine for Cutting Forms, -of which the-followinglis a specification.

My invention relates to machines for cutting forms and I have illustrated it as ap plied to a machine of the kind disclosed in. U. S. LettersPatent No. 6i7,888 dated April 17,1900.

' In using machines of this class.- itsom'etimes happens that-an abrupt" change of direction is to be made at one or more points of the travel of the leader. At such times lost motion or the shaking of the machine or other causes may give slighttbut undosirable, movement ofthe leader with come I quent defective cutting of the material. I

The main object of my invention is to providemeans for. holding the leader immovable duringa part of thetravel ofthe knife. in a form cutting, machine in which the leader. has. both horizontal and vertical 1110vement.-

Another; objectiis toprovide means for accurately positioning.- he .leader When-it is to be lockedor held stationary."

Another ,object is to provide a leader'locking mechanism which is absolutely free from -lost motion While holding the leader'this mechanism being positive,- directand accliratein action but simple in-constnuctlori and having the great. advantageof ready applicability to amachine for cutting forms=W1th-J- i' v p than that" for which "the i leader. opening. a

is designed theri tlie leader and; its slide are I out any disassemblingiof the same-w In the drawings: Figure 1 is a partial ele' vation of a machine. embodying my invention; Fig. 2 is a partial plan on line 2-.2 of Fig. 1; Fig. 3 is a rear elevation of the parts shown in Fig. 2; andgFig. l is a detail of the; leader locking member. c

The machine comprises four vertical rods a which at their lower endshave secured'to' them the .ways a a which support the slide at,

To the slider-a v is fastened in the usual manner leadern? Whose flanged opening a cooperates W1 .th the'kmfe form the knife a throughout the'circuit of itstravel.

beingsecured to the lower end of-a stem a and its slide are shifted back their first position" again. Throughout the reinai'n'deroffthe operation the leaderfand' "signed for a middle or interine 'is used to out either larger onsmallertapa,

being used for each 's ize i .;.1e 0 is of the SHITIIQSIZG and shape. v.

*a' different form a a in guiding which the k The form a actswasa presser .=foot t0 h"o1d the Work firmly .on the table: a said form Fig; 2 there times by means of a lever a The. knife a is on a knife-earner a rotatably mounted on v pro- Wl'llCll' isswung by means ofa vAt their upper a 'crossheada thatis fastened by means of a set'screW' to stem-a said rods extending through, andguided by, bearings a on the frame of the machin The ways aand the lea-der car ried thereby are 'sl1ifted.,toward' and from I the Work by rods a" in unison with the knife,-

carrier and formia i \Vheria tap is being' cutfrom stock of the same size as that for whieh the opening a is designed then-the leader'and its. slide are held stationary while the knife travels around its circuit. When, however, it isdesired to 'cut a tap'larger than that for Which the .leadenopening a is designed then as the knife travels in the direction of the arrow ('Fig. '2) from'th'e point marked w to the point marked y t'he leaderand its slide-are shifted toward the right and thereafter while"theiknifelis passing from the point marked "2 to the point marked 24) the.leader its slide-must be held absolutelystationary t0 insur'e accurate cutting, especially while outting'arou'n'd the pointer.

a by tliensual Whcdatz'tp is to be out which is saaiershifted toward the left" as the, knife passes.

e passes from It will thus'be' seen thatthe (leader that'i's out. i

The form (i from thefp'oint irj to'the point marked 1 and to the'i'ight as the knif the?poin t marked e to'the point marked 40..

is ,de}. diate. size and as the tap that is out and as will be seen from.

may be asharp point at around V I mfeswings and abruptly changes its direction of movement and itis highly desirable-that the knife negotiatethis ,part

D of the operation pr'operlythat the leader a v which s raised and loweredat the proper 'be held rigidly immovable since any slight movement or play due for instance to lost motion between the parts of the mechanism I locking and holding mechanism intended to.

meet'these requirements but no such mechanism has been adapted for use with a leader that is shifted toward and from the work as well as laterally. Moreover in actual practice such mechanism was not effective and far from satisfactory so far as providing efficient holding means was, concerned because said mechanism comprised a multiplicity of inter-connected parts, the principle 'of construction of which made it impossible to avoid more or less lost motion at connecting joints so that accurate and completely effective action of said mechanism was not had in actual practice and moreover such lost motion resulted in rapidowear of the joints which in 'turn resulted in defective action of the mechanism.

In accordance with this invention the member which engages the slide to hold it immovable during its periods of rest directly engages both its actuator, herein shown as a'cam, and the leader carrying slide and in such position that wear-does not affect the action of said member.

My invention further contemplates a direct and simple drive for the cam which a'ctuates the locking member and the embodiment of the improvement in the form of an attachment which may be applied to a machine of the type shown in said patent.

The gear Z) is the same as the gear 0 of the patent referred to. As hereinshown this gear 7) drives a gear 1 fixed to the upper end of a shaft 2 that is journaled in a bracket 3 bolted to the frame. At its lower endshaft 2 carries a cam 4 that engages an arm 5 fast on a spindle 6 journaled on bracket 3. This spindle 6 has adjustably fastened to it by means of a set screw 7 a depending arm 8 cooperating with a slotted lug 9 fixed to the leader carrying slide a As will be clear the arm 5, spindle 6 and arm 8 are rigidly secured together and constitute a single locking member for the leader slide} the end of the arm 8 being wedge-shaped so that when arm 8 enters the slot of lug 9 as described later saidwedge shaped end will act upon one side or the other of said slot to shift the slide to accurately position it as it is locked by said arm 8. The cam 4 is timed so as to swing the arm 8 into engagement with the lug 9 when'the knife reaches the point cc; to hold said arm in engagement with said lug while the knife 11s travellng from the point w with me.

m or, in other words, it-acts to automatically and accurately position the leader as it locks it against movement, such positioning in machines for cutting forms being new By means of the screw 7 the arm 8 may be adjusted to compensate for wear of cam 4, said arm 8 or said socket lug 9.

From the foregoing it will be observed that in effect only two parts intervene between the driving gear 0 and the leader slide, one of said two parts bein made up of gear 1,.shaft 2 and cam 4 an the other of arm 5 spindle 6 and arm 8, so that the driving gear- 6 acts through the minimum number of relatively movableiparts to control the leader slide instead of through a multiplicity of relatively movable parts and joints.

As will be'clear the bracket 8 carries the entire 'leader slide locking and positioning mechanism so that said brackehwith said In other words the locking mechanism herein shown is a self-contained, complete attachment that may be connected up with the ordinary mechanism of a machine of this type merely'by securing the bracket in position on the frame.

The means foractuating and adjustin the slide o may include a shaft 0 journale in a bracket 0 fixed to the frame of the machine, as well as arm 0 and link a and other elements fully disclosed in detail in E51 Patent No. 961,907, dated June 21,

WVhat I claim is: i 1. A machine for cutting forms comprismg a work table; a leader movable laterally and toward and-from the work table; means for operating the leader; a knife controlled by said leader; means for operating the knife; a leader-support; and means independent of said support to lock the leader during a part of the travel of the knife.

2. A machine for cutting forms comprismg a leader; a support for said leader; means to operate the leader; a knife carrier guided by the leader; and means separate from the leader operating means and independent of said su port to hold the leader immovable during a-part of the travel of the knife and to position the leader when it is to be held immovable.

3. A machine for cutting forms comprising a fixed frame; a Work table; a leader carrier movable toward and from said Work table; a leader slide; means for operating said slide; a movable locking member mounted on the fixed frame and adapted to directly engage the leader-carrying slide to lock it rigidly to said frame but With provision for movement of said slide toward and from the Work table; and means to operate said locking member so as to cause it to engage the slide While the latter is held at rest by its operating means.

4. A machine for cutting forms comprising a knife; means for actuating the knife; a leader; means for operating the leader; a gear; means for operating said gear; a shaft to which said gear is fixed; a cam fast on said shaft; a bell crank lever actuated by said cam and-cooperating directly with the leader slide, said cam operating the bellcrank lever so as to cause the latter to hold the leader slide immovable during a portion of the travel of the knife.

5. A .machine for cutting forms comprising a leader carrier; a leader mounted on said carrler; a support for said carr er;

means to operate the leader; and means separate from said'leader operating means and independent of said support to first position said leader and then lock it immovable When said leader is held stationary by its operating means.

6. A machine for cutting forms comprising a knife; means for actuating the knife; a Work table; a leader movable laterally and toward and from the worktable; means for operating the leader; agear; means for operating said gear; a shaft to Which said gear is fixed; a cam fast on said shaft; and a bell crank lever actuated by said cam and cooperating directly With the leader slide, said cam operating the bell crank lever so as to cause the latter to hold the leader slide immovable during a portion of the travel of the knife.

7 A machine for cutting forms comprising a Work table; a leader movable laterally toward and from the Work table; a knife controlled by said leader; a shaft carrying a gear; means to rotate the shaft; leader operating means operated by said gear; a second gear distinct from said leader operating means but operated by said A first gear; and means operated by said sec- 0nd gear to hold the leader immovable during a part of the travel of the knife.

ERNEST L. PATTEN.

Witnesses:

ALICE G. LORD, ARTHUR F. RANDALL. 

